Xxx ILLUSTRATIONS 
Le Conte, Elements of Geology (based upon his figure) (Fig. 223). 
Lewis, Robert Z, Second Geological Survey of Pennsylvania (Fig. 114). 
Libby, Prof. William, Jr., Princeton, Mass. (Photographs by) (Figs. 105, 
110, 119, 120, 202, and 207). 
McGee, Plates 16 and 25, and Figs. 261, 262, and 263 are made partly upon 
the basis of information contained in the McGee geological maps, pub- 
lished by the U.S. Geological Survey. Plate 16 is in the main a copy 
of his map, though some changes have been made. 
Marsh, Am. Journ. Sci., Vol. XXVI., 1883 (Fig. 251) ; Same, Vol. XXIII, 
1882 (Fig. 255); Mem. Peabody Museum of Yale College (Figs. 254 
and 256). 
Mississippi River Commission Maps (Fig. 97). 
Nasmyth and Carpenter, The Moon (Fig. 195). 
Nature, Vol. XXX., p. 324 (Fig. 78). 
Notman (Photographer), Montreal, Canada (Fig. 178). 
Powell, Exploration of the Colorado River (Figs. 85 and 184). 
Richthofen, China (Fig. 60). 
Russell, Eighth Annual Report, United States Geological Survey (Fig. 116) ; 
Thirteenth Annual Report, same (Figs. 115 and 121). 
Shaler, Twelfth Annual Report, U. S. Geological Survey (Figs. 66 and 196). 
Sommer (Photographer) (Fig. 203). 
Soule Photograph Co., Boston, Mass. (Figs. 129 and 131). 
Stoddard, S. R. (Photographer), Glens Falls, N.Y. (Figs. 35, 56, 98, 100, 
128, 136, 140, and 148). 
Swiss Topographic Maps (Plates 8 and 10 and Fig. 95). 
Symons, The Eruption of Krakatoa (Fig. 208). 
Teall, British Photography (Figs. t7 and 18). 
Thurston, J. H. (Photographer), Boston, Mass. (Fig. 59). 
United States Coast Survey, Maps (Plates 11 and 13). 
United States Geological Survey (Photographs) (Figs. 53, 64, 99, 102, 134, 
167, 169, 201, 205, 215, and 231). Taken by Russell, Diller, and other 
members of the Survey. 
United States Geological Survey, Geological Atlas (Figs. 164, 187, and 188). 
Ward, H. A., Rochester, N.Y. (Models by) (Figs. 181 and 252, and Plate 21). 
White, Bulletin IV., United States Geological Survey (Fig. 259). 
Willis, Thirteenth Annual Report, U. S. Geological Survey (Fig. 194). 
Williston, Prof. S. W. (Photograph by), Lawrence, Kansas (Plate 4). 
Wright and Upham, Greenland Ice Fields (Fig. 118). 
Young, Mem. Nat. Acad. Sci., Vol. II., 1884 (Fig. 144). 
Zittel, Paleontological Wall Chart (Fig. 289); Paleontologie, I., 3 (after 
Hockstetter) (Fig. 260). 
